172-65528A-01 (VS3-E/VS3-P/VS3-EP) 19 January 2021
Automatic Air Vent
(Clean Air Vent)
VS3-E / VS3-P / VS3-EP
Manufacturer
881 Nagasuna, Noguchi, Kakogawa, Hyogo, 675-8511, Japan
Tel: [81]-(0)79-422-1122 Fax: [81]-(0)79-422-0112
Copyright © 2021 by TLV Co., Ltd. All rights reserved
1
Contents
Introduction ....................................................................... 1
Safety Considerations ....................................................... 2
Features ............................................................................ 4
Operation .......................................................................... 4
Specifications .................................................................... 5
Configuration ..................................................................... 5
Installation ......................................................................... 6
Maintenance ...................................................................... 7
Disassembly/Reassembly ................................................. 8
Troubleshooting .............................................................. 10
TLV EXPRESS LIMITED WARRANTY ............................. 11
Option (2-piece Clamp for Bolts and Nuts) ..................... 13
Introduction
Thank you for purchasing the TLV automatic air vent (clean air vent).
This product has been thoroughly inspected before being shipped from the
factory. When the product is delivered, before doing anything else, check the
specifications and external appearance to make sure nothing is out of the
ordinary. Also be sure to read this manual carefully before use and follow the
instructions to be sure of using the product properly.
The automatic air vent (clean air vent) is designed to automatically discharge/
release air trapped in water-carrying pipes during water transport. It also
automatically discharges the air that was entrained in the water during
operation and has subsequently been separated and collected in specific
locations in the piping.
For products with special order specifications or options, if detailed
instructions for the special order specifications or options are not contained in
this manual, please contact TLV for full details.
This instruction manual is intended for use with the model(s) listed on the
front cover. It is necessary not only for installation but for subsequent
maintenance, disassembly/reassembly and troubleshooting. Please keep it in
a safe place for future reference.
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Indicates a DANGER, WARNING or CAUTION item.
DANGER
Indicates an urgent situation which poses a threat of death or
serious injury
WARNING
Indicates that there is a potential threat of death or serious injury
CAUTION
Indicates that there is a possibility of injury or equipment /
product damage
WARNING
DO NOT use for toxic, flammable or otherwise hazardous fluids.
This product is an air vent that discharges air from water piping
systems. Use only for water and/or air. This product is for intended
use only. Improper use may result in such hazards as damage to the
product or malfunctions that may lead to serious accidents.
NEVER apply direct heat to the float.
The float may explode due to increased internal pressure, causing
accidents leading to serious injury or damage to property and
equipment.
CAUTION
Install properly and DO NOT use this product outside the
recommended operating pressure, temperature and other
specification ranges.
Improper use may result in such hazards as damage to the product
or malfunctions that may lead to serious accidents. Local regulations
may restrict the use of this product to below the conditions quoted.
DO NOT use this product in excess of the maximum operating
pressure differential.
Such use could make discharge impossible (blocked).
Take measures to prevent people from coming into direct
contact with product outlets.
Failure to do so may result in burns or other injury from the
discharge of fluids.
Safety Considerations
Read this section carefully before use and be sure to follow the
instructions.
Installation, inspection, maintenance, repairs, disassembly, adjustment
and valve opening/closing should be carried out only by trained
maintenance personnel.
The precautions listed in this manual are designed to ensure safety and
prevent equipment damage and personal injury. For situations that may
occur as a result of erroneous handling, three different types of cautionary
items are used to indicate the degree of urgency and the scale of potential
damage and danger: DANGER, WARNING and CAUTION.
The three types of cautionary items above are very important for safety: be
sure to observe all of them as they relate to installation, use, maintenance,
and repair. Furthermore, TLV accepts no responsibility for any accidents
or damage occurring as a result of failure to observe these precautions.
Symbols
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Continued on the next page
3
CAUTION
When disassembling or removing the product, wait until the
internal pressure equals atmospheric pressure and the surface
of the product has cooled to room temperature.
Disassembling or removing the product when it is hot or under
pressure may lead to discharge of fluids, causing burns, other
injuries or damage.
Be sure to use only the recommended components when repairing
the product, and NEVER attempt to modify the product in any way.
Failure to observe these precautions may result in damage to the
product and burns or other injury due to malfunction or the discharge
of fluids.
Use only under conditions in which no freeze-up will occur.
Freezing may damage the product, leading to fluid discharge, which
may cause burns or other injury.
Use only under conditions in which no water hammer will occur.
The impact of water hammer may damage the product, leading to
fluid discharge, which may cause burns or other injury.
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Features
1.
When water starts to flow through the
piping, air trapped within the piping is
pushed along by the water pressure and
enters the air vent. At first, because the
float is positioned in the lower part of the
air vent, the valve is fully open and the air
passes through the valve seat and is
discharged rapidly through the vent.
2.
When the air has been discharged and
water begins to enter the air vent, the
float starts to rise due to buoyancy. This
pushes it upwards against the valve
opening, thus closing the air vent.
If there is a rapid rise in water level
(caused by rapidly opening a shut-off
valve, etc.), a small amount of water may
leak with discharged air immediately
before the air vent closes.
3.
When more air is trapped in the air vent
due to the inflow of water having closed
the valve, the water level in the air vent is
forced down and consequently the level of
the float falls, opening the valve. Air can
now again escape through the air vent,
and as it does so the level of the water
rises, pushing the float upwards again to
close the valve. In this way the VS3 series
automatically adjusting air vents
constantly respond to the flow of air.
4.
When draining the piping, the air vent
automatically opens to introduce air and
remove water more easily (preventing a
vacuum from forming in the piping).
Valve seat
Valve seat
Valve seat
Air
Air
Water
Water
1. Precision-ground float and 3-point seating provide the tightest seal.
2. All stainless steel construction provides outstanding corrosion resistance.
3. The air vent has no hinges or levers: the only moving part is the polished float,
which eliminates concentrated wear and provides long service life.
4. Simple construction with few parts allows for easy maintenance.
5. The air vent is small and light.
Operation
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DO NOT use for toxic, flammable or otherwise hazardous fluids.
This product is an air vent that discharges air from water piping system.
Use only for water and/or air. This product is for intended use only.
Improper use may result in such hazards as damage to the product or
malfunctions that may lead to serious accident.
WARNING
Install properly and DO NOT use this product outside the recommended
operating pressure, temperature and other specification ranges.
Improper use may result in such hazards as damage to the product or
malfunctions which may lead to serious accidents. Local regulations
may restrict the use of this product to below the conditions quoted.
CAUTION
DO NOT use this product in excess of the maximum operating pressure
differential; such use could make discharge impossible (blocked).
CAUTION
Use only under conditions in which no freeze-up will occur. Freezing
may damage the product, leading to fluid discharge, which may cause
burns or other injury.
CAUTION
Production Lot No.
Connection Inner
Diameter***
Connection
Standard No.
CNo.**
Model
Nominal
Diameter
Connection
Standard
Maximum
Operating Pressure
Maximum Allowable
Pressure*
Nominal Diameter
Connection Standard
Maximum Operating
Temperature (TMO)
Maximum Allowable
Temperature* (TMA)
CNo.**
Connection
Standard No.
No.
Name
1
Body
2
Cover
3
Float
4
Body Clamp
5
Cover Gasket
6
Valve Seat
7
Wing Nut
Body
Cover
Specifications
Refer to the indications on the body and the cover for detailed specifications.
* Maximum allowable pressure (PMA) and maximum allowable temperature (TMA) are PRESSURE
SHELL DESIGN CONDITIONS, NOT OPERATING CONDITIONS.
** CNo. (Charge / Mill No.) is displayed for products with options. This item is omitted when there are
no options.
*** Connection inner diameter is displayed for products with options. This item is omitted when there
are no options.
Configuration
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DO NOT use for toxic, flammable or otherwise hazardous fluids.
This product is an air vent that discharges air from water piping systems.
Use only for water and/or air. This product is for intended use only.
Improper use may result in such hazards as damage to the product or
malfunctions that may lead to serious accident.
WARNING
Install properly and DO NOT use this product outside the recommended
operating pressure, temperature and other specification ranges.
Improper use may result in such hazards as damage to the product or
malfunctions which may lead to serious accidents. Local regulations
may restrict the use of this product to below the conditions quoted.
CAUTION
Take measures to prevent people from coming into direct contact with
product outlets. Failure to do so may result in burns or other injury from
the discharge of fluids.
CAUTION
Tolerance Angle for Installation - 5°
55
55
Make sure the air vent is installed with the raised TLV lettering on the body horizontal.
Fig. 1
Installation
Installation, inspection, maintenance, repairs, disassembly, adjustment and valve
opening/closing should be carried out only by trained maintenance personnel.
1. As this air vent is for the discharge of air from water-carrying pipes, it must
not be used for the discharge of air from steam spaces.
2. Before installation, be sure to remove all protective seals.
3. Before installing the product, open the inlet valve and blow out the inlet piping
to remove any piping scraps, dirt and oil. Close the inlet valve after blowdown.
4. This product must be installed vertically, with the inlet at the bottom and the
outlet at the top, and should be inclined no more than 5° horizontally and
front-to-back.
5. Install the product in a location where air is likely to
collect such as a bend in the piping.
6. Install the product so that the outlet pipe reaches a
drainage vessel or ditch. Make sure the end of the
pipe is above the waterline, so that dirt and water
can not be sucked up by vacuum when the system
shuts down (Fig. 1).
7. For the inlet connection, use a pipe/fitting, etc. with an
inner diameter of at least 16 mm (
5
/8 in), such as a
schedule 40 pipe or pipe nipple with a nominal
diameter of 15 mm (1/2 in). A smaller pipe may prevent
water/air displacement.
If there is a problem, determine the cause using the “Troubleshooting” section in this
manual.
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Maintenance
Take measures to prevent people from coming into direct contact with
product outlets. Failure to do so may result in burns or other injury from
the discharge of fluids.
CAUTION
Be sure to use only the recommended components when repairing the
product, and NEVER attempt to modify the product in any way. Failure to
observe these precautions may result in damage to the product or burns
or other injury due to malfunction or the discharge of fluids.
CAUTION
Normal
:
Air is discharged as it accumulates, with the air vent
closing (with no leakage) when no air is present in the
piping.
Blocked
(Discharge Impossible)
:
No air is discharged though air accumulates in the air
vent.
Leakage
:
Water is discharged or leaks through the product outlet
during closed position.
Procedure
Cover Gasket: Check for warping and damage
Valve Seat: Check for scratches or wear
Float: Check for scratches or dents
Operational Inspection
A visual inspection of the following items should be done on a daily basis to
determine whether the product is operating properly or has failed.
If the air vent should fail, it may cause water leakage or hindrance to water flow.
Parts Inspection
When parts have been removed, or during periodic inspections, use the following
table to inspect the parts and replace any that are found to be defective.
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Disassembly/Reassembly
NEVER apply direct heat to the float. The float may explode due to
increased internal pressure, causing accidents leading to serious injury
or damage to property and equipment.
WARNING
Take measures to prevent people from coming into direct contact with
product outlets. Failure to do so may result in burns or other injury from
the discharge of fluids.
CAUTION
When disassembling or removing the product, wait until the internal
pressure equals atmospheric pressure and the surface of the product
has cooled to room temperature. Disassembling or removing the
product when it is hot or under pressure may lead to discharge of fluids,
causing burns, other injuries or damage.
CAUTION
Be sure to use only the recommended components when repairing the
product, and NEVER attempt to modify the product in any way. Failure to
observe these precautions may result in damage to the product or burns
or other injury due to malfunction or the discharge of fluids.
CAUTION
Part
During Disassembly
During Reassembly
Fig. A
Wing Nut
Body Clamp
Loosen the wing nut with
a tool such as an
adjustable wrench, then
remove the body clamp
Tighten the wing nut to the
proper torque
Grooves
Body / Cover
Remove, being careful
not to scratch the
surface
With the gasket in place, align
grooves and gently place the
body on the cover (Fig. A)
Cover Gasket
Remove the gasket and
clean sealing surfaces
Replace with a new gasket if
damaged
Part
During Disassembly
During Reassembly
Fig. B
Float
Remove, being careful
not to scratch the
polished surfaces of the
float
Insert into body/cover, being
careful not to scratch its
polished surface, take care not
to scratch or damage the
seating surface of the valve
seat (Fig. B)
Valve Seat
Part Name
Torque
Nm
(lbf·ft)
Wing Nut
10
(7)
Use the following procedures to remove components. Use the same procedures in
reverse to reassemble.
(Installation, inspection, maintenance, repairs, disassembly, adjustment and valve
opening/closing should be carried out only by trained maintenance personnel.)
Detaching / Reattaching the Body and the Cover
Detaching / Reassembly of Components Inside the Body / Cover
Table of Tightening Torques
(1 Nm 10 kgcm)
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Exploded View
Body
Float
Cover Gasket
Cover
Body Clamp
Body Clamp
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Troubleshooting
When disassembling or removing the product, wait until the internal
pressure equals atmospheric pressure and the surface of the product
has cooled to room temperature. Disassembling or removing the
product when it is hot or under pressure may lead to discharge of fluids,
causing burns, other injuries or damage.
CAUTION
Problem
Cause
Remedy
No air is
discharged or
discharge is
poor
The trapped air cannot displace the
water in the piping
Correct the inlet piping
(Inner diameter should be at least
16mm (5/8 in))
The valve seat is clogged with dirt or
foreign matter
Clean the valve seat
The inlet or outlet piping is clogged
Clean the piping
The operating pressure exceeds the
maximum specified pressure for this
product
Replace the air vent with a model
that has a suitable operating
pressure rating
Water leaks
when the vent
is closed
There is a build-up of rust or scale on
the valve seat or the valve seat is
damaged
Clean the valve seat or replace with
a new valve seat
The float is misshapen, dirty or has a
film build-up
Clean the float or replace with a
new float
The installation angle of inclination is
incorrect
Correct the installation
The vent does
not close and
water is blowing
The float is damaged or filled with water
Replace with a new float
The specific gravity of the liquid is outside
the specifications for this product
(this product is for water systems)
Select a product with suitable
specifications for the operating
conditions
When the product fails to operate properly, use the following table to locate the
cause and remedy.
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TLV EXPRESS LIMITED WARRANTY
Subject to the limitations set forth below, TLV Corporation, a North Carolina corporation
(“TLV”) warrants that products which are sold by it, TLV CO., LTD., a Japanese corporation
(“TLVJ”) or TLV International, Inc., a Japanese corporation (“TII”), (hereinafter the
“Products”) are designed and manufactured by TLVJ, conform to the specifications
published by TLV for the corresponding part numbers (the “Specifications”) and are free
from defective workmanship and materials. With regard to products or components
manufactured by unrelated third parties (the “Components”), TLV provides no warranty
other than the warranty from the third party manufacturer(s), if any.
Exceptions to Warranty
This warranty does not cover defects or failures caused by:
1. improper shipping, installation, use, handling, etc., by other than TLV or service
representatives authorized by TLV; or
2. dirt, scale or rust, etc.; or
3. improper disassembly and reassembly, or inadequate inspection and maintenance by
other than TLV or service representatives authorized by TLV; or
4. disasters or forces of nature or Acts of God; or
5. abuse, abnormal use, accidents or any other cause beyond the control of TLV; or
6. improper storage, maintenance or repair; or
7. operation of the Products not in accordance with instructions issued with the Products
or with accepted industry practices; or
8. use for a purpose or in a manner for which the Products were not intended; or
9. use of the Products in a manner inconsistent with the Specifications; or
10. use of the Products with Hazardous Fluids (fluids other than steam, air, water,
nitrogen, carbon dioxide and inert gases (helium, neon, argon, krypton, xenon and
radon)); or
11. failure to follow the instructions contained in the TLV Instruction Manual for the
Product.
Duration of Warranty
This warranty is effective for a period of the earlier of: (i) three (3) years after delivery of
Products to the first end user in the case of sealed SST-Series Products for use in steam
pressure service up to 650 psig; (ii) two (2) years after delivery of Products to the first end
user in the case of PowerTrap® units; or (iii) one (1) year after delivery of Products to the
first end user in the case of all other Products. Notwithstanding the foregoing, asserting a
claim under this warranty must be brought by the earlier of one of the foregoing periods, as
applicable, or within five (5) years after the date of delivery to the initial buyer if not sold
initially to the first end user.
ANY IMPLIED WARRANTIES NOT NEGATED HEREBY WHICH MAY ARISE BY OPERATION OF
LAW, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE AND ANY EXPRESS WARRANTIES NOT NEGATED HEREBY, ARE
GIVEN SOLELY TO THE INITIAL BUYER AND ARE LIMITED IN DURATION TO ONE (1) YEAR
FROM THE DATE OF SHIPMENT BY TLV.
Exclusive Remedy
THE EXCLUSIVE REMEDY UNDER THIS WARRANTY, UNDER ANY EXPRESS WARRANTY OR
UNDER ANY IMPLIED WARRANTIES NOT NEGATED HEREBY (INCLUDING THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE), IS
REPLACEMENT; PROVIDED: (a) THE CLAIMED DEFECT IS REPORTED TO TLV IN WRITING
WITHIN THE APPLICABLE WARRANTY PERIOD, INCLUDING A DETAILED WRITTEN
DESCRIPTION OF THE CLAIMED DEFECT AND HOW AND WHEN THE CLAIMED DEFECTIVE
172-65528A-01 (VS3-E/VS3-P/VS3-EP) 19 Jan 2021
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PRODUCT WAS USED; AND (b) THE CLAIMED DEFECTIVE PRODUCT AND A COPY OF THE
PURCHASE INVOICE IS RETURNED TO TLV, FREIGHT AND TRANSPORTATION COSTS
PREPAID, UNDER A RETURN MATERIAL AUTHORIZATION AND TRACKING NUMBER ISSUED
BY TLV. ALL LABOR COSTS, SHIPPING COSTS, AND TRANSPORTATION COSTS
ASSOCIATED WITH THE RETURN OR REPLACEMENT OF THE CLAIMED DEFECTIVE
PRODUCT ARE SOLELY THE RESPONSIBILITY OF BUYER OR THE FIRST END USER. TLV
RESERVES THE RIGHT TO INSPECT ON THE FIRST END USER’S SITE ANY PRODUCTS
CLAIMED TO BE DEFECTIVE BEFORE ISSUING A RETURN MATERIAL AUTHORIZATION.
SHOULD SUCH INSPECTION REVEAL, IN TLV’S REASONABLE DISCRETION, THAT THE
CLAIMED DEFECT IS NOT COVERED BY THIS WARRANTY, THE PARTY ASSERTING THIS
WARRANTY SHALL PAY TLV FOR THE TIME AND EXPENSES RELATED TO SUCH ON-SITE
INSPECTION.
Exclusion of Consequential and Incidental Damages
IT IS SPECIFICALLY ACKNOWLEDGED THAT THIS WARRANTY, ANY OTHER EXPRESS
WARRANTY NOT NEGATED HEREBY, AND ANY IMPLIED WARRANTY NOT NEGATED
HEREBY, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE, DO NOT COVER, AND NEITHER TLV, TII NOR TLVJ WILL IN ANY
EVENT BE LIABLE FOR, INCIDENTAL OR CONSEQUENTIAL DAMAGES, INCLUDING, BUT NOT
LIMITED TO LOST PROFITS, THE COST OF DISASSEMBLY AND SHIPMENT OF THE
DEFECTIVE PRODUCT, INJURY TO OTHER PROPERTY, DAMAGE TO BUYER’S OR THE FIRST
END USER’S PRODUCT, DAMAGE TO BUYER’S OR THE FIRST END USER’S PROCESSES,
LOSS OF USE, OR OTHER COMMERCIAL LOSSES. WHERE, DUE TO OPERATION OF LAW,
CONSEQUENTIAL AND INCIDENTAL DAMAGES UNDER THIS WARRANTY, UNDER ANY
OTHER EXPRESS WARRANTY NOT NEGATED HEREBY OR UNDER ANY IMPLIED
WARRANTY NOT NEGATED HEREBY (INCLUDING THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE) CANNOT BE EXCLUDED,
SUCH DAMAGES ARE EXPRESSLY LIMITED IN AMOUNT TO THE PURCHASE PRICE OF THE
DEFECTIVE PRODUCT. THIS EXCLUSION OF CONSEQUENTIAL AND INCIDENTAL DAMAGES,
AND THE PROVISION OF THIS WARRANTY LIMITING REMEDIES HEREUNDER TO
REPLACEMENT, ARE INDEPENDENT PROVISIONS, AND ANY DETERMINATION THAT THE
LIMITATION OF REMEDIES FAILS OF ITS ESSENTIAL PURPOSE OR ANY OTHER
DETERMINATION THAT EITHER OF THE ABOVE REMEDIES IS UNENFORCEABLE, SHALL
NOT BE CONSTRUED TO MAKE THE OTHER PROVISIONS UNENFORCEABLE.
Exclusion of Other Warranties
THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, AND ALL
OTHER WARRANTIES, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE EXPRESSLY
DISCLAIMED.
Severability
Any provision of this warranty which is invalid, prohibited or unenforceable in any jurisdiction
shall, as to such jurisdiction, be ineffective to the extent of such invalidity, prohibition or
unenforceability without invalidating the remaining provisions hereof, and any such
invalidity, prohibition or unenforceability in any such jurisdiction shall not invalidate or render
unenforceable such provision in any other jurisdiction.
13901 South Lakes Drive, Charlotte, NC 28273-6790, U.S.A.
Tel: [1]-704-597-9070 Fax: [1]-704-583-1610
172-65528A-01 (VS3-E/VS3-P/VS3-EP) 19 Jan 2021
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Option (2-piece Clamp for Bolts and Nuts)
No.
Name
1
Body
2
Cover
3
Float
4
Body Clamp
5
Cover Gasket
6
Valve Seat
7
Clamp Nut
8
Clamp Bolt
Configuration
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Disassembly/Reassembly
NEVER apply direct heat to the float. The float may explode due to
increased internal pressure, causing accidents leading to serious injury
or damage to property and equipment.
WARNING
When disassembling or removing the product, wait until the internal
pressure equals atmospheric pressure and the surface of the product
has cooled to room temperature. Disassembling or removing the
product when it is hot or under pressure may lead to discharge of fluids,
causing burns, other injuries or damage.
CAUTION
Part
During Disassembly
During Reassembly
Fig. A
Clamp Bolts /
Nuts
Body Clamp
Loosen clamp nuts with a
tool such as an adjustable
wrench, then remove the
body clamp
Tighten clamp nut to the
proper torque
Grooves
Body / Cover
Remove, being careful not
to scratch the surface
With gasket in place, align
grooves and gently place
the body on the cover (Fig.
A)
Cover Gasket
-
Replace with a new gasket
if damaged
Part
During Disassembly
During Reassembly
Fig. B
Float
Remove being careful not to
scratch the polished
surfaces of the float, the
body and the cover
Insert into body/cover, being
careful not to scratch its
polished surface, take care
not to scratch or damage
the seating surface of the
valve seat (Fig. B)
Valve Seat
Body
Part Name
Torque
N·m (lbf·ft)
Distance Across Flats
mm (in)
Clamp Bolts / Nuts
10 (7)
13 (1/2)
Use the following procedures to remove components. Use the same procedures in
reverse to reassemble.
(Installation, inspection, maintenance, repairs, disassembly, adjustment and valve
opening/closing should be carried out only by trained maintenance personnel.)
Detaching / Reattaching the Body and the Cover
Detaching / Reassembly of Components Inside the Body / Cover
Table of Tightening Torques
(1 Nm 10 kgcm)
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Body
Float
Cover Gasket
Cover
Clamp Nut
Clamp Bolt
Body Clamp
Clamp Nut
Exploded View
172-65528A-01 (VS3-E/VS3-P/VS3-EP) 19 Jan 2021
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